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Are you trying literally to open up your Laptop with a screw driver or something...
or are you trying to install XP on a Vista pre-installed laptop...
Here's the solution...
Go to the BIOS setup [press F8 on startup], & change the disk controller setting from AHCI to IDE. might worth the try.Some Laptops don't have option of SCSI or IDE. But there are SATA Enable/Disable option. Try disabling SATA.
Make sure you have all the necessary drivers for your laptop before installing windows...
Let me know if this doesn't solve the problem...